JPH02259360A - Operational control method for continuous hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To prevent the outlet temperature of hot water from hunting by a method wherein the hot-water side of a mixing valve is fully opened when the demand number is a lower one, and the full opening operation is carried out after the outlet temperature of a kitchen hot-water supply unit is lower than the temperature set in a remote controller plus an allowable temperature. CONSTITUTION:When a heat exchanger 4B is used alone, and the demand number is a lower one, the hot-water side of a mixing valve 14 is fully opened under a condition that the outlet temperature of hot water is close to a set temperature, and the mixing valve 14 is set on a temperature value that is set in a remote controller 18B, only when the demand number is a higher one. Thus, the hot-water side of the mixing valve 14 is fully opened so as not to mix water into hot water under the condition that the outlet temperature of hot water is close to the set temperature when the demand number is a lower one, so that, unlike conventional methods, the hot water can be delivered without hunting and overshooting in the outlet temperature until the hot water reaches a flow rate where combustion becomes OFF.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention connects two water heaters, one for the bathroom and one for the kitchen,
If the hot water output is low and the number is low, only one water heater is operated, and if the hot water output is large and the number is high, both water heaters are operated to supply hot water to the bathtub. The present invention relates to a method for controlling the operation of a connected water heater equipped with a mixing valve for mixing hot water and water in front of a side water supply port.

(Prior Art) Fig. 3 is an explanatory diagram showing the configuration of a connected water heater.In this figure, 100 and 200 are, for example, 3.
This is a water heater for bathrooms and kitchens that has a hot water supply capacity of size 5 to size 16. Therefore, gas is supplied to burners IA and IB via solenoid valves 2A, 2B and proportional valves 3A, 3B. It is configured as follows, and is controlled by a microcomputer control section, which will be described later. 4A and 4B are heat exchangers, 5A
, 5B is a fan.

In addition, a water flow sensor 6 is installed on the water supply side of this water heater.
A, 6B and variable temperature water governor 7A.

7B is attached, and the temperature of the water supply is detected by a thermistor 8. Further, thermistors 9A and 9B are attached to the hot water outlet pipes of the water heater 100 and the water heater 200, respectively, to detect the temperature of the hot water. The hot water pipe 10 of the bathroom water heater 100 is connected to the hot water tap (or mixed tap) 11 in the bathroom, and the hot water pipe of the kitchen water heater 200 is connected to the hot water tap of the bathroom water heater via the water selector valve 12. The hot water outlet pipe of the kitchen water heater 200 is connected to the kitchen hot water tap 15 via a mixing valve 14 for mixing hot water and water whose temperature is set by a gear motor 13. 16 is a thermistor that detects the hot water temperature reaching the hot water tap 11; 17 is a running water switch that is turned on when the kitchen hot water tap is opened; 18A is a bathroom remote control;
Reference numeral 18B is a kitchen remote control, and reference numeral 19 is a microcomputer control unit, and the water temperature is set on the remote controllers 18A and 18B based on signals from each thermistor, water flow sensor, water switch, etc.

The variable water temperature type water governors 7A and 7B control the amount of hot water so that hot water at a constant temperature, for example 60°C, can be obtained under any water temperature conditions without throttling the hot water tap 11.15. In order to achieve this, for example, it is controlled to about 7 Q/win when the water temperature is 5°C, and about 1217 sin when the water temperature is 25°C.

In the connected water heater configured as described above, when the amount of hot water output is small and the number of hot water is low, the water switching valve 12 is closed and the water heater 100 is closed.
．． Only one of the water heaters 100.2001 is operated to supply hot water, and in the case of a high number such as when filling a bathtub, both water heaters 100.2001 are operated, thus, for example, from about 3.5 to 32 can provide hot water.

[Problem to be solved by the invention]

By the way, in the above-mentioned conventional connected water heater, the mixing valve 14 is set at the temperature set by the remote control, regardless of the opening/closing of the hot water tap in the kitchen and the flow rate of the heat exchanger 4B.

For this reason, for example, set temperature 36℃, water temperature 20℃, 4B
When the flow rate of the side heat exchanger is 3Q/win (required number = 036-20 The temperature of the hot water coming out of the exchanger 4B, that is, the temperature of the hot water entering the mixing valve 14, is higher than the set temperature, so the mixing valve 14 acts to throttle the amount of hot water that enters the heat exchanger 4B, and when the amount of hot water is throttled, heat exchange is performed. The temperature of the hot water on the side of the burner further rises, which causes the mixing valve 14 to further reduce the amount of hot water, and while this operation is repeated, the flow rate drops below the combustion OFF level and the burner is extinguished. When the fire is extinguished in this way, water will come out from the heat exchanger 4B, and the mixing valve 14 will now operate to open the hot water side, and when the amount of water exceeds the combustion ON flow rate, it will ignite again, and the same operation as described above will occur again. There is a problem in that this occurs repeatedly, resulting in a hunting phenomenon in the hot water temperature.

The present inventors have improved the problems of the prior art as described above,
In order to provide a method for controlling the operation of a connected water heater that does not cause the hot water temperature to hunt even if the required number is lower than the minimum number of the appliance, the position of the mixing valve is controlled by remote control based on the flow rate of the heat exchanger 4B. When one kitchen is used alone and the required number is low, the hot water side of the mixing valve (heat exchanger side) is fully opened to mix hot water. Instead, the temperature position is set on the remote control only when the requested number is large (see Japanese Patent Application No. 1-19622).

According to this invention, when the kitchen is used alone and the required number is low, the mixing valve is fully opened and hot water is not mixed, so it is possible to prevent the hot water temperature from hunting as described above. When the required number is large, hot water can be mixed at the temperature set on the remote control to obtain hot water at the desired temperature.

However, in the embodiment of the prior invention, the mixing valve is fully open on the hot water side when the hot water tap is closed, so when starting hot water supply, the gear motor of the mixing valve starts from the fully open position on the hot water side. When you want to obtain hot water at the set temperature TSP, the remaining hot water from the previous use (kitchen TSP 1X"C) is dispensed without being mixed before the gear motor reaches the predetermined mixing position. x as shown in Figure 4
There is a problem that overshoot of dey occurs.

In addition, you can use a bathroom water heater and a kitchen water heater at the same time.
In addition, if the kitchen water heater is used alone and the request number is switched from a high temperature setting using the bathroom remote control to a mode with a lower request number, the gear motor of the mixing valve will start operating immediately after the mode change. In order to start, the hot water side immediately opens fully from the hot water mixing position, and in this case, the remaining hot water in the kitchen water heater that was being dispensed using the bathroom remote control is in a high temperature state, and the hot water is not mixed. Hot water is dispensed from the kitchen hot water faucet, as shown in Figure 5.

There is a problem in that an overshoot of (set temperature TSP of the bathroom remote control - set temperature TSP of the kitchen remote control) occurs.

The present invention is based on the invention of the prior application, and furthermore, it is an object of the present invention to provide a method for controlling the operation of a connected water heater, which does not cause the above-mentioned problems.

[Means to solve the problem]

In order to achieve the above object, the present invention controls the position of the mixing valve in two ways depending on the flow rate of the heat exchanger of the kitchen water heater: the temperature position set on the remote control and the hot water side fully open position. However, when the kitchen is used alone and the required number is low, the hot water side of the mixing valve (heat exchanger side) is fully opened and hot water is not mixed, and only when the required number is large, the temperature position set on the remote control is set. The mixing valve is fully opened to supply hot water while detecting that the hot water temperature of the kitchen water heater is lower than the temperature set on the remote control plus a certain allowable temperature.

[Effect]

In the present invention, when the required number is low, the hot water side of the mixing valve is fully opened and hot water is not mixed, so it is possible to prevent the hot water temperature from hunting as in the conventional case, and the mixing valve can be fully opened. Since this operation is performed after detecting that the hot water temperature of the kitchen water heater is lower than the temperature set on the remote control plus a certain allowable temperature, it is possible to prevent overshoot due to immediate full opening as in the prior invention.

〔Example〕

The control method of the present invention will be explained below with reference to FIGS. 1 and 2 with reference to FIG.

When the power switch is turned on and then the operation switch of the remote controller is turned on, the mixing valve 14 is set to an appropriate operating temperature, such as a shower temperature position. When the hot water faucet 15 on the kitchen side is opened in this state, the water flow switch 17 is turned on, and when the water flow rate sensor 6B detects that the flow rate has reached the flow rate required for operating the appliance, hot water is supplied, although detailed explanation will be omitted. Vessel 2
00 is automatically operated and the heat exchanger 4B side burns.

At this time, the water flow sensor 6B detects the flow rate FS2 flowing through the heat exchanger 4B, and the thermistor 8 detects the water temperature Tl1N, and α is calculated. Here, α is the following: a: number of appliances TSP: set temperature of the kitchen remote controller 7wlN: water temperature, which is the flow rate flowing into the heat exchanger under the above operating conditions.

Next, the flow rate α calculated as described above and the heat exchanger 4B
The temperature set on the remote controller is read only when the flow rate FS2 is larger than α, and the mixing valve 14 is set at the temperature set on the remote controller. Vessel 4A
If it is not burning, compare the set temperature range TSP set on the kitchen remote control 18B plus a certain allowable temperature A with the hot water temperature TB of the heat exchanger 4B (detected by thermistor "gB"). When it is detected that the outlet temperature T is lower than the set temperature range TSP plus A, the mixing valve 14 is fully opened to the hot water side, and the flow rate detection by the water flow sensor 6B and the water temperature detection by the thermistor 8 are continued.In other words, in the present invention is heat exchanger 4
B is used alone, and when the required number is low, the mixing valve 14 is fully opened on the hot water side on the condition that the outlet temperature is close to the set temperature, and the mixing valve 14 is opened only when the required number is large. Set the temperature to the position set on the remote control.

In this way, in the present invention, when the required number is low, hot water is not mixed on the condition that the outlet temperature is close to the set temperature, and the mixing valve is fully opened on the hot water side, so hunting as in the past is avoided. The amount of hot water produced is below the combustion OF without causing the overshoot of the prior invention.
Hot water can be supplied until the flow rate reaches F.

In addition, when using the bathroom side and the kitchen side at the same time, as shown in Figure 1, the mixing valve should be at the set temperature position of the kitchen remote control, and the set temperature of the 4B side heat exchanger should be the same as that of the 4A side heat exchanger. Even if the set temperature of the 4A side heat exchanger is high, the kitchen side mixes hot water and water so that the set temperature can be obtained.

As described above, even during hot water supply by mixing hot and cold water, the flow rate detection by the water flow rate sensor 6B and the supply water temperature detection by the thermistor 8 are continued to calculate the flow rate β at which the hot water side should be fully opened. Here, β is: When FS2 becomes small, it is determined whether or not the 4A side is in combustion, and when the A side is not in combustion, it is further determined in the same manner as above whether or not Tg, P+A>T, and the T
When SP+A>TB, the mixing valve 14 is fully opened on the hot water side, and when the 4A side is in combustion and when TSP+A>T
If it is not a, mix hot water with water. That is, switching to hot water mixing by fully opening the hot water side of the mixing valve, and switching from hot water mixing to fully opening the hot water side are performed as shown in FIG.

The table below shows the operation modes according to the present invention as described above.

FS2 is an operation mode table in which b is a differential; the flow rate β obtained by the above calculation and the flow rate of the 4B side heat exchanger]
When FS2 is larger than β, hot water supply by mixing hot water is continued, and from β, mode ■
~ ■ indicates the use of the bathroom alone, ■ indicates high capacity, ■ medium capacity, and ■ indicates low capacity. Mode ■■ is for use only in the kitchen, ■ is for a low number, and ■ is for a high number. ■ is when the kitchen and bathroom are used at the same time.

〔Effect of the invention〕

As described above, according to the present invention, two water heaters having hot water supply capacities ranging from a low number to a high number are installed together, and
In a connected water heater, the hot water outlet pipe of one of the water heaters is connected to a mixing valve for mixing hot water and cold water that is controlled by a remote control.

This has the effect of preventing hot water supply from hunting when the required number is low, and also prevents overshoot in such a case to provide smooth hot water supply.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing the operation control method according to the present invention, Fig. 2' is an explanatory diagram of switching the mixing valve, Fig. 3 is a schematic diagram of an appliance showing an example of a water heater to which the present invention is applied, Figs. The figure is an explanatory diagram of overshoot in the prior invention. LA, IB... Burner, 2A, 2B... Solenoid valve, 3A. 3B...Proportional valve, 4A, 4B...Heat exchanger, 5
A, 5B...Fan, 6A, 6B...Water flow sensor, 7A, 7B...Water governor, 8...Water temperature detection thermistor, 9A, 9B, 116...Thermistor, 1
0...Hot water pipe, 11.15...Hot water tap, 12...
・Water switching valve, 13...Gear motor, 14...Mixing valve, 17...Water switch, 18A, 1
8B...Remote control. Patent applicant Gaster Co., Ltd. Agent Patent attorney Masami Akimoto (1 other person) Figure a: No. f (M TSP: tf'7t; Conr+h*: a~I
N: A*jL b ′ Te) 7! Lensiyano V FS2:B Slightly Pu”'!fL*%

Claims (1)

[Scope of Claims] 1. Two water heaters, one for the bathroom and one for the kitchen, each having a hot water supply capacity ranging from a low number to a high number, are installed together, and the hot water outlet pipe of the bathroom water heater is connected to the water heater for the kitchen. The hot water pipes are connected through a water switching valve, and when the capacity of one water heater is within the range, the water switching valve is closed and only one water heater is operated, and when the capacity of one water heater is exceeded. The water switching valve is opened to operate both water heaters to supply hot water, and the hot water pipe of the kitchen water heater is connected to the hot water faucet via a mixing valve for mixing hot water and water that is controlled by a remote control. In the connected water heater, the mixing valve is controlled in two ways, a temperature position set on the remote control and a hot water side fully open position, depending on the flow rate flowing through the heat exchanger of the kitchen water heater. When used alone and the required number is low, the heat exchanger side of the mixing valve is fully opened to supply hot water without mixing hot water, and only when the required number is large, the temperature position set on the remote control is used to supply hot water. , and the connecting type, characterized in that the fully opening operation of the heat exchanger side of the mixing valve is performed after detecting that the hot water temperature of the kitchen water heater is equal to or lower than the temperature set on the remote control plus a certain allowable temperature. How to control water heater operation. 2. When you turn on the operation switch of the kitchen remote control, the mixing valve is set to the set temperature position where hot water and water are mixed, and hot water is supplied, and the kitchen water heater operates based on the water supply temperature at that time, the number of requests, and the temperature set on the remote control. The flow rate α flowing through the heat exchanger is calculated, the flow rate α obtained by the calculation is compared with the flow rate FS_2 flowing through the heat exchanger, and only when the flow rate FS_2 is larger than α, the set temperature of the remote control is read and the mixing valve is is the set temperature position of the remote control, and when the flow rate FS_2 is smaller than α, it is determined whether the bathroom heat exchanger side is burning, and if it is not, it is determined that the set temperature table T_S_P+A set on the kitchen remote control and the hot water output of the heat exchanger are set. A method for controlling the operation of a connected water heater, characterized in that the mixing valve is fully opened on the hot water side when it is detected that the outlet temperature T_B is lower than a set temperature range T_S_P+A by comparing the hot water temperature T_B. 3. When supplying hot water by mixing hot water and water, continue to detect the flow rate and the temperature of the supplied water, calculate the flow rate β that should fully open the hot water side of the mixing valve, and use the calculated β and the flow rate FS_2 of the heat exchanger. By comparison, when FS_2 is larger than β, hot water supply by mixing hot water continues, and when FS_2 becomes smaller than β, it is determined whether the bathroom water heater is burning, and if it is detected that it is not burning, the kitchen water heater is further heated. Compare the set temperature range T_S_P+A set on the remote control and the hot water outlet temperature T_B of the heat exchanger, and the hot water outlet temperature T_B will be found to be higher than the set temperature range T_S_P+A.
A method for controlling the operation of a connected water heater, characterized in that when it is detected that the temperature is lower than _S_P+A, the hot water side of the mixing valve is fully opened, and when the bathroom water heater is in combustion and when T_S_P+A>T_B is not established, the hot water is mixed. .